[F:1][C:2]([F:11])([F:10])[C:3]1[CH:4]=[C:5]([OH:9])[CH:6]=[CH:7][CH:8]=1.[H-].[Na+].[I:14]I.Cl>C1(C)C=CC=CC=1>[I:14][C:6]1[CH:7]=[CH:8][C:3]([C:2]([F:10])([F:11])[F:1])=[CH:4][C:5]=1[OH:9]A toluene (200.0 mL) solution of 3-trifluoromethylphenol (16.6 g) was added dropwise to a toluene (300.0 mL) suspension of sodium hydride (7.1 g) under ice cooling. The reaction mixture was stirred at the same temperature for 30 minutes, and iodine (26.0 g) was then added thereto. The solution was stirred at room temperature for 12 hours. Subsequently, 3 N hydrochloric acid was added to the solution so that the pH of the solution was adjusted to 2. The solution was extracted with ethyl acetate. The organic layer was sequentially washed with water and a saturated brine and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure. The title crude compound (30.8 g) was obtained as pale yellow oil.
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